Anticorrosive coating.



UNITED STATES FREDERICK E.. DODGE, OE

MALDEN, MASSACHUSETTS.

ANTICORROSI VE COATING.

Specification of No Drawing.

To all whom it may concern.

Be it known that I, FREDERICK I). Donor, known as a putt chaser, andground for a citizen of the United States, residing at the city ofM'altlen, in the county of Middlesex and Commonwealth of Massachusetts,

haveinvented a certain new and useful (Jomposition of Matter Entitled.Anticorrosivc Coating, of which the following is a specificat-ion.

The object of this invention is thecompounding of a coating or cementfor appli' cation particularly to iron 'and other metals requiringprotection a'ainst oxidation, for filling holes in metal, lor smoothingrough surfaces, and generally for coating objects with either a thick ora thin layer which rapidly burdens, and which when fully set cannot bechipped, scaled or peeled ofi by moisture. heat, wear or even the sharpblows of a hammer.

I usually prepare this composition, which 1 term an anticorrosive brushand trowel cement, in two shades, one brown and the other. bail.Although I do not restrict myself to these two shades, I preferthe samebecause well adapted for all the usual purposes for which the cementisdesigned.

For the production of the brown cement, the following materials areused, and in about the proportions named:

Red lead 20 parts. Monoxid of lead 25 White 1ead 25 Whiting L 18 Boiledlinseed oil 2}. Venetian red 2% Japan drier 2 Spirits of turpentine 2Lamp black .025 China clay 3 V To ma-ke'the bufi' cement, the followingmaterials are compounded In mixing the above, the red lead, mo-

noirid of lead, white lead and linseed oil are placed together in anordinary paint Application filed November 22, 1902i.

e t Patented N0v.-8, 1910.

Serial no. 529,435.

grinding machine, and .ground to a stifl paste. This mass is then put ina mill two hours. If. t e brown coating is the I one being produced, theVenetian red and lamp black are now added, followed by the operation,the whiting is next slowly added, and finally the China clay. After.this, the mill is run for anothertwo hours, making a total of four hoursrinding".

For the buff coating, the French ellow ocher should be substituted inlieu of t e Venetian red and lamp-black, but the process is otherwisethe same.

()f the above materials, the monoxid of lead should be unvitrified, andwhat known as "1nassicot, the whitin should be bolted the Venetian redshoult be of the bright grade; the French yellow oeher should be a drypowder; the lamp-black in oil, and the China clay in a fine powder.

affected by the other elements, and can be used with any of the othersto form the cement. p

The China clayis employed because of its property of holding in solutionthe more weighty pigments, and to lighten the specific sential as theothers, and may be substituted bysilica, gypsum, alumina, soapstone anda few other inert elements of like characteristics.

()ne advantageof the whiting used is that it-acts as a good filler, andis an absorbent of the oil, thereby rendering the surface of the coatingsomewhat dry so that successive coats of the cement will adhere one tothe other in case several layers are desired, this whiting, as well asthe China clay and other elements named in connection therewith, may begrou )ed uhder the general heading of inert earths.

In applying this cement to iron, any sur-' face rust is first removed.If the coating turpentine and the drier. With the mill in.

In place of the white lead, there may be 9-5 gravity of the whole; butit is not so esis put on with ordinary care, all rusting of the metalwill absolute y cease. The reason why all rusting beneath tlns cement isprevented is because it keeps from the-metal all possible carbonic acid,hydrogen peroxid and other oxidizing elements, and further I I i t lexcludes any clectrolytic action It is there- 1 fore impossible for theiron or other metal to be superficially afi'ected, no matter for howlong a time the same is exposed to any oxidizing source, provided thecoating remains intact. The cement being absolutely impervimis tomoisture and ordinary acids,

. as'well as resistant to wear, there is no way in which the metal canbe reached by water, or chemicals such as would be met with in usualstructures.

So hard and resistant is this cement when fully hardened, thatlltlIIllllLl'-l)l()\\'5 will not Ila-kc it off from the metal surface towhich it. has been applied, and it is only by means of a hammer andcold-chisel that it can be removed.

\Vhen used for filling blow-holesand other cavities in cast; metal, thiscement will hehave to the cutting or borii'ig tool practically like, theiron, steel or other metal itself. .i

In above formulae, .I. hate provided for but two shades or colors of thecoating butthe same may be made in almost any other de sired shades.subject to the presence of the red lead and monoxid of lead, by-thcs'ubstitution of such coloring matters as are. necessary for theproduction thereof.

This cement; when it is to be used as a brush paint, should be thinnedwith pure spirits of turpentine to the proper consisteney. Whenever thecement is not to be used for a few days, it should be kept in a tightlyclosed receptacle and have its surface covercd with turpentine.

While it is proven that most remarkable etiects are obtained in the useof the coating wherein the unvitrified 'mono'xid of lead is employed asabove set forth, yet I find that an unusually good coatingfor metals isproduced when usual litharge of commerce is substitutedtherefor,provided the proportions of the ingredients are as stated;

'hat I claim as my invention and for which I desire Letters Patent is asfollows,

to wit t. The within described cement composed of red lead twenty parts;monoxid-of lead twenty-live parts; white lead twenty-five parts;whitingcightecn parts; linseed oil two and one-half parts; Japan driertwo parts; spirits of turpentine two parts, and (bin-a clay three parts.

2. The within described cement composedof red lead, unvitrified monoxidof lead, white lead and an inert earth in substantially equalproportions. and, small amounts of boiled linseed oil, Japan drier andspirits of'turpentine. i l

In testimony that I claim the foregoing invention, I have hereunto setmy hand this 18 day of November, 1905 t-"ltl ll)l')]t.'l(,l{ l l)()l')(-l l.

Witnesses EDMUND J. FARR, Tnmms J. Hnwlrr.

